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An Elementary Proof of the Cayley Formula Using Random Maps
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classification
math.CO
keywords
formulacayleyelementelementaryproofrandombijectivecalculation
abstract
Cayley's formula states that the number of labelled trees on $n$ vertices is $n^{n-2}$, and many of the current proofs involve complex structures or rigorous computation. We present a bijective proof of the formula by providing an elementary calculation of the probability that a cycle occurs in a random map from an $n$-element set to an $n+1$-element set.
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